[PATCH] [CodeGenPrepare] Move extractelement close to store if they can be combined.

[Quentin Colombet]

- Do not introduce undefined behavior when the variable to be promoted is on the rhs of a division.
- Support ConstantFP value for promotion.
- Change the target hook to something more precise that takes the vector type and the index of the extract.
- Use as many undef as possible when materializing the vector constant.
- Add a stress mode to cover all the added features even if they were not relevant for ARM.
- Update the test cases: ConstantFP, Division (def and undef), Splat Constant, and as many as possible undef.

http://reviews.llvm.org/D5921

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  test/CodeGen/ARM/vector-promotion.ll
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